Hello, i had build 2 h bridges based on a design found on the web for a robot. The two bridges drive two 12v electric drill motors. I have been having a few problems with the p channel mofets frying when the battery voltage drops to much. I am at uni doing mechanical engineering and so have not really had much experience with different component but was told by one of my friends doing mechatronics that the mosfets will start acting like resistors if there isn't enough voltage supplied. Firstly is this true and what can i do to fix it. Thanks Sam.